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APPARATUS FOR TURNING AND POLISHING SHAFTING.

3 Sheets-Sheet 1.

Patet'ed Mar. 13, 1894.

l Mmmm' E" (No Model.) 3 Sheets-Sheet 2.

P. MEDART. ,APPARATUS POR TURNING AND POLISH-ING SHATING.' No. 516,543, Patented Mar. 13, 1894..

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3 Sheets- Sheet 3. P. MEDART. APPARATUS FOB. TURNING ANDl POLISHING SHAFTING.

Patented Mar. 13, 1894-.

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UNITED STATES.

PATENT Orricn.

PHILIP MEDART, OF ST. LOUIS, MISSOURI, ASSIGNOR OF ONE-HALF TO WILLIAM MEDART, OF SAME PLACE.

APPARATUS FOR TURNING AND POLISHING SHAFTING.

SPECIFICATION forming part of Letters Patent N o. 516,543, dated March 13, 1894.

Application led October 4, 1893. Serial No. 437119@ (N0 model-l To @ZZ whom t may concern:

Be it known that I, PHILIP MEDART, a citizen of the United States, residing in the city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Apparatus forTurning and Polishing Shafting, of which the following is a specification.

My invention relates to the turning and polnishlng-of round rods or shafting, and its objects are simultaneously to remove the scale and outer coating or 'surfaces of such shafts, thus reducing them to uniform dimensions, while producing a smooth surface thereon, and to lmpart a finished appearance to the shaftl'ng by polishing its surface. These ends Iattaln by clamping or supporting the shafting 1n a suitable bed-plate, and feeding the shaft endwise through revolving chasers and cutters, ad Justable radially, relatively to each other and to the shaft in the cutter-head, so as Iirst to form a screw-thread or series of screw-threads onthe shaft, by means of one set of chasers, by means of which threads the shaft is fed through the cutter-head, and is` simultaneously reduced; then further reducing the diameter of the shaft by cutting off the apices or ridges of the threads formed by the preceding set of chasers or cutters, and then turning down the shaft to the required dimensions by a cutter or-cutters, from which the shafting passes directly to suitable pollshers, which finish it. The chasers are preferably made with two or more threads, so as to secure rapidity of action, without undue increase of driving power, or heating of the cuttlng tools. The threads or teeth on the chasers are preferably arranged at such an angle or pltch as to cut two or more parallel threads on the shaft. The object of this arrangement is to form quick screw-threads on the shaft to give it a quick longitudinal movement, at the same time having the threads close together so as to reduce the `shaft without leavlng uncut spaces between the threads. I may employ any desired number of chasers and cutters in each set. I preferably employ two sets of chasers and one set of cutters, as the second set of chasers may be arranged to cut off the apices or ridges of the threads formed by the first set of chasers, as above described.

The subject-matter claimed is hereinafter specied.

The accompanying drawings represent so much only of apparatus adapted for'carrying 55 out myinvention in the best waynow knownto me, as is necessary to illustrate the subjectmatter claimed. Unless otherwise indicated, the parts are of usual well-known construction. Y 6o Arrows indicate the direction of movement of some of the moving parts.

Figure l represents a plan or top view of the apparatus, with the polishing mechanism in horizontal section; Fig. 2, a corresponding view of the cutter-head and its actuating gearing; Fig. 3, an end View, and Fig. 4, a side view thereof. Figs. 5 to 8, both inclusive, show detail views of the cutter-head, and tools on an enlarged scale, Fig. 5 being a side view; 7o Fig. 6, a longitudinal section therethrough, on the line 6-6 of the preceding ligure; Fig.

7, a corresponding section, on the line 7-7 of- Fig. 5, and Fig. Sja longitudinal, sectional diagram, illustrating the method of cutting; and Fig. 9 represents a vertical, longitudinal section through the polishing apparatus.

The mechanism is shown as mounted on a main frame A, A. A band-wheel B, driven from any suitable prime-mover, actuates a 8o driving-shaft b, carrying a gear-wheel B', engaging a similar wheel, O, on a tubular shaft c, mounted in suitable bearings on the main frame, and carrying a cutter-head D, secured thereto by a screw or other suitable detachable connection. The drawings show this cutter-head as provided with a set of four radial chasers E, and an adjacent set of four radial chasers E', and also with a set of cutters E2, all of which are arranged equi-dis- 9o tantly around the head, and separately adjustable radially relatively to each other therein, sliding endwise in blocks d, carried by the head D. The chasers and cutters are controlled by suitable set-screws d. Theblocks d, are provided with suitable recesses to hold the cutters in position and permit of their adj ustment, the outer ends of the recesses being closed by plates D', secured by bolts d2,`to the blocks d, which are provided with holes d3, to roo lreceive the bolts.

I find the use of four or more sets of cutters ridges of the screw-threads thus formed, and a cutter-head adapted to remove the resulting screw-threads.

3. The combination, substantially as hereinbefore set forth, of a tubular cutter-head, a chaser therein with teeth set to form screwthreads on the shafting and to feed it thereby, a second separate chaser with its teeth set to form in the apices or ridges of the screwthreads first formed grooves of the same depth as those formed by the teeth in the first chaser, and thereby double the number of threads, and a cutter for removing resulting screw-threads.

4. The combination, substantially as hereinbefore set forth, of a tubular cutter head, a set of separate chasers therein, with the threads arranged at a pitch or inclination to form two or more parallel quick screw threads on the shaft, and feed it thereby, a set of cutters to remove the screw threads, and means for adjusting the chasers and cutters separately or independently in the head relatively to' each other and to the shaft.

5. The combination, substantially as hereinbefore set'forth, of the main frame,a tubular shaft mounted in suitable bearings on the main frame, a cutter-head secured to said tubular shaft, a series of blocks mounted in the cutter-head, radially adjustable chasers and cutters mounted in said blocks, a bushing (f) within the tubular shafting, and an endwise moving clamp for supporting one end of the shaft to be reduced as it passes through the cutter-head.

6. The combination, substantially as hereinbefore set forth, of a main frame, a cutter head mounted therein, separate chasers and cutters carried thereby, means for adjusting the chasers and cutters relatively to each Vother and to the shaft, a transverse clamping frame in which the shafting is secured, and polishing mechanism, the organization being such that the shaft is fed through the cutter and polisher by means of the screw threads cut on the shaft by the chasers and subsequently removed before polishing. c

7. The combination, substantially as hereinbefore set forth, of the main frame; the cutter-head; the clamping frame carrying the shafting to be finished; the tubular sleeve on the opposite side of the cutter-head, and the polishing mechanism mounted on thetubular sleeve, the organization being such that the shafting is supported by the 'tubular sleeve, while being polished and fed therethrough by means of the screw-threads formed upon the shaft, but cut away before polishing.

8. yThe combination, substantially as hereinbefore set forth, of a rotating cutter-head, provided with chasers and cutters; a hopper containing abrading or polishing material,l and a polisher, the organization being such that the rod or shafting is fed through the polisher by the screw-threads formed thereon in passing through the cutter-head.

In testimony whereof I have hereunto subscribed my name.

PHILIP MEDART. Witnesses:

B. WASHINGTON MILLER, LLOYD B. WIGHT. 

